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To understand the first paragraph better, go to second paragraph with the Quora link. Stephen Perrenrod { MIT- Harvard PhD } clarifies very nicely.
1} > ..."The new result shows that black holes gain mass in a way consistent with them containing vacuum energy, providing a source of dark energy and removing the need for singularities to form at their centre.....
.......This is the first observational evidence that **black holes actually contain vacuum energy** and that they are ‘coupled’ to the expansion of the Universe, increasing in mass as the Universe expands – a phenomenon called **‘cosmological coupling’.** If further observations confirm it, cosmological coupling will redefine our understanding of what a black hole is. "...
2} > > Roy Kerr ---rotational black holes ergo all black holes-- makes clear, that, he believes a neutron star or something is a core of black holes, and a singularity ring { looping photon trajectory's } around that core.
.." An international team of astronomers appears to have detected significant evolutionary increase in the mass of supermassive black holes, amounting to about a factor of 8 since cosmological redshift z = 1.
They hypothesize that this is due to cosmological coupling between black holes with dark energy cores, and the universe’s expansion.
Their argument is that the black hole masses have grown much faster than could be explained by accretion and mergers.And by fast they mean in proportion to the volume growth of the expanding universe. "...
See the third or so post by Stephen Perrenrod in following Quora link.
3} > > > And this all appears to me, to be similar/related/associated ---and more so--- if we think of Roy Kerrs ring singularity as a Space-time torus wherein, its inner negative surface is the core of black holes. Roy and negative aspect of black holes both addressed by Perrenrod in his Quora post.
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Science and Nature